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(No Model.) a Sheets-Sheet 1. H. S. S. WATKIN. ANEROID BAROMETBR.

No. 394,668. Patented Dec. 18, 1888.

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H. s. s. WATKIN; ANEROID BAROYMETBR.

' 3' Sheets-Sheet 2.

(No Model.)

Patented Dec. 18, 1888.

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3 Sheets-Sheet (No Model.)

H. S. S. WATKIN. ANEROID BAROMBTER.

Patented Dec. 18, 1888.

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' UNITED STATES PATENT OFFICE.

HENRY SA'MIIEL SPILLER IVATKIN, OF THE \YILDERNESS, CANIWVELL ROAD, IVOOLlVICI-I, COUNTY OF KENT, ENGLAND.

ANEROID BAROMETER.

SPECIFICATION forming part of Letters Patent No. 394,668, dated December 18, 1888. Application filed February 27, 1888. Serial No. 265,389. (No model.) Patented in England November 13, 1886, No. 14,730.

To all whom it may concern.-

Be it known that I, HENRY SAMUEL SPIL- LER \VATKIN, of The Wilderness, Cantwell Road, oolwich, in the county of Kent, England, major royal artillery, have invented certain new and useful Improvements in Aneroid Barometers, (for which I have obtained Letters Patent of the United Kingdom of Great Britain and Ireland, dated November 13, 1886, and numbered 14,730,) of which the following is a specification.

The invention relates to that class of aneroid barometers which are provided with a large open scale, or a scale extended beyond the ordinary scale into two or more circles or convolutions, so as to increase the distance between the graduations or reading-points, and

. in combination with which the index-hand or pointer is required to make two or more com- 2o plete revolutions.

In such class of instrument the volute spring ordinarily employed to control the motion of the hand or pointer spindle is found to buckle, and therefore to act irregularly on the said spindle. The first part of the invention consists of means for remedying this defect, and the second .part relates to improvements in the indicating mechanism of such class of barometers.

In the accompanying drawin l have represented various modes in which my invention may be carried into effect.

similar letters of reference.

Figure 1 is an elevation, partly in section on the line 1 l, Fig. 2, showing the principal working parts of the instrument and omitting the casing and dial. Fig. 2 is a front view of the same parts, partly in section on the line 2 2, Fig. 1. Fig. 2 is an elevation of the indicator portion of the mechanism shown in Fig. 2. Fig. 3 is an axial section of the entire instrument, on a smaller scale, on the line 3 3,

Fig. 4. Fig. l is a face view thereof. Fig. 5

is an elevation of the parts shown in Fig. 1,

- but representing the substitution of a cylinw drical coiled spring for the helical hair-spring 1 shown in Figs. 1 and 2. Fig. 6 is a partial face view showing a modification in the dial.

Fig. 6 is an elevation of the indicator portion of the mechanism shown in Fig. 6. Fig.

In all the figures like parts are indicated by 7 is an elevation illustrating another modification in the controlling-sprin Fig. Sis a front view of the same parts. Fig. 9 is an axial sectional elevation showing another modification in the controlling-spring. Fig. 10 is a partial face view of the same parts. Fig. 11 is an axial sectional elevation illustrating a modification in the device to indicate the scale from which the reading is to be taken. Fig. 12 is a partial face view of the same parts. Fig. 13 illustrates a modification in which the dial rotates beneath a fixed indicator.

(1 represents the case of the instrument; I), the "acuunrchamber; c, the counteractingspring; (I, the operating-lever attached to and operated by the spring 0; e, a link connecting the lever d to an adjustable arm, f, fixed on the rocking bar f; and f an arm or lever, also fixed to the rocking barf, and which has its upper end connected by a chain, g, to a worm or screw, 71', formed or fixed on the spindle 11, carrying the reading hand or pointer 1'.

The spindle 71 is mounted in bearings carried by the bracket The parts above described i'orm no part of my present invention.

In such class of instrument it is usual to employ a volute spring, 7, sufficient to control the motion of the hand or pointer spindle h to the extent of a single revolution; but such spring, when employed in combination with a hand or pointer which is required to make two or more complete revolutions, is found to buckle, and therefore to act irregularly on the spindle 71. In order to remedy this defect, I, according to one arrangement, as shown at Figs. 1, :3, 3, and 11 inclose the said volute spring, I, in a suitable box or case, in, which is so proportioned as to permit of the full action of the sping Z, and is yet so shallow as to prevent the buckling thereof when it has performed more than a complete turn, thus enabling the controlling-spring to accomplish the additional work required of it in connection with the spindle of an open-scale aneroid barometer.

In another modification, as represented at Figs. 5 and 6, I substitute for the ordinary volute spring, I, a cylindrical coiled spring, 1*,

surrounding the index-hand or pointer spindle h, and of sufficient length to enable it to make the required. number of revolutions and yet to act efficiently on the spindle h.

5 According to another arrangement, as rep-' resented at Figs. 7 and 8, I fix one end of a cylindrical coiled spring, 1*", to a fixed stud,

a, while the other en d is connected to a thread or ligature, Z, passed several times round a 10 spiral groove or screw-thread, 7L2, formed on the spindle 72., and such thread or ligature Z is fixed to the spindle h beyond such spiral groove or screw-thread 72. which latter is formed in the opposite direction to that of I 5 the screw-thread or worm 7t, around which the chain or other connection g, actuatin the spindle h in one direction, is coiled. The

spring Z** may occupy the position shown by either the full lines or the dotted lines in Fig. 8.

In still another modification, as represented at Figs. 9 and 10, I employ a volute spring, Z,

of the ordinary form;- but I fix it to and around a separate spindle, 0, which has a 2 5 toothed wheel, 0", fixed thereon, which works into a toothed pinion, h", fixed on the hand or pointer spindle h, whereby any required number of revolutions may be given to the latter and a smaller number to the spring-spindle 3o 0, thereby securing the correct action of the spring lupon the hand or pointer spindle h.

I would here remark that the improvements above described are equally applicable to aneroid barometers of the character described 3 5 in the specification of Letters Patent granted to me June 14:, 1887, No. 364,692.

In carrying out the second part of my invention I in some cases employ a dial, 70, with two or more concentric circles of scales en- 40 graved thereon, as represented at Figs. 2, i, .6, 10, and 12, and in combination therewith I employ a hand or pointer, "i, sufficiently long to extend across allot such concentric circles, and according to one arrangement, as

" shown at Fig. 4, I form such hand '2' with as many fingers or pointers t" as there are circles of scales, each of such pointers t" pointing to a separate circle; and in order to indicate which circle of scales should be looked at I employ, according to the arrangement shown at Fig. 2, an indicator, 19, connected to or operated by the rocking barf and chain g, giving motion to the hand or pointer spindle h in such manner as to cause such indicator p to point to the circle of divisions and fig ures to be looked at, the diameter or trace of the circle being made to correspond to the movement of the pointer 13 for each complete turn of the index-finger 'i; or, according to the arrangement represented at Fig. (i, I cause such indicator hand or pointer 19 to point to one or other of a seriesof figures, 1 2 3, engraved on the dial-plate 7a, to indicate which scale or circle of divisions and figures is to be looked at; or I form such indicator 1?, as represented at Figs. 3, 4, 9, and 10, with a series of of the rocking barf and chain g may, as represented at Figs. 11 and 12, cause the revolution of an indicator or finger, p, on a small circle, W, on the dial-plate j/c. This circle k is engraved with figures denoting which circle of graduations is to be read under the index-needle i. Incarrying this arrangement into effect the indicator p is mounted on an axis, 19 which has fixed thereon a screwthread, 1), around which thechain g passes in its way from the arm f to the spindle h.

In the various arrangements represented at Fi s. 2, +1., 6, 10, and 12 the dial-plate has arrows k engraved thereon between the several circles of scales, in order to indicate the points where the reading of one circle ends and another begins. The hand or pointert' may, if desired, extend only to the inner circular scale, in which case I employ a movable pointer, q, connected to a movable ring, 4, on the case, and extendingacross all the scales and nearly meeting the hand or pointer 41, so that any scale can be read off by placing the said movable pointer in line with the hand or pointer 'i, as shown by the dotted lines in Fig. 4.

The breaks in the concentric scales or circles represented in Figs. 2, 4t, (3, 10, and 12 readily show the points at which the reading is to be transferred from one scale to the next, and the figures arranged in either of the various modes described indicate at once to the observer which scale is to be read to show the correct indication.

Having thus described my invention, the following is what I claim as new therein and. desire to secure by Letters Patent:

1. A11 aneroid barometer having a large open scale and a hand or pointer adapted to make more than one revolution, and a controlling-spring guided or controlled to prevent buckling, substantially as herein described.

2. An aneroid barometer having a hand or pointer adapted to make more than one revolution, and a dial with two or more concentric scales on which the indications of the hand or pointer are successively read, the graduations on the outer scales forming a continuation of the inner scale, substantially as set forth.

3. An aneroid barometer having a reading hand or pointer adapted to make more than one revolution, several concentric scales on which the indications are-to be successively read, and a hand or pointer for indicating which scale is to be observed, substantially as described.

' 4. An aneroid barometer constructed with a large open scale, a spindle having a hand or pointer adapted to make more than one lution, a rock-bar having an arm, a chain con- 1 necting' the arm to the spindle, and an indi cator operated by the spindle and arm, substantially as described.

7. An aneroid barometer constructed with an open scale, a spindle having a hand or pointer adapted to make more than one revolution, a rock-bar having an arm, a chain connecting" the arm to the spindle,a slotted dial, and an indicator, p, working in the slot of the dial, substantially as described.

HENRY SAMUEL SPILL ER WATKIN.

Vitnesses:

G. DA. ALEXANDER,

Capt. R. A. M. TAYLOR,

Lt. R. A. 

